A novel technique for I/Q imbalance and CFO compensation in OFDM systems

Author

Yu, Jui-Yuan ; Sun, Ming-Fu ; Hsu, Terng-Yin ; Lee, Chen-Yi

Author_Institution

Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

2005

fDate

23-26 May 2005

Firstpage

6030

Abstract

In this paper, a novel baseband IQ estimation and compensation technique is proposed to overcome the joint effects of CFO (carrier frequency offset) and IQ imbalance. The proposed method uses a one-shot algorithm which is able to estimate and compensate the non-ideal effect up to a gain error of 1 dB, phase error of 10°, and CFO of 50 ppm at a carrier frequency of 2.5 GHz in 64QAM OFDM systems. Under this condition, the system performance has less than 0.8 dB design loss in terms of PER and is shown to have more than 10 dB improvement compared with the reference design.

Keywords

OFDM modulation; channel estimation; error compensation; quadrature amplitude modulation; radio receivers; 2.5 GHz; 64QAM systems; CFO compensation; I/Q imbalance compensation; OFDM systems; PER; baseband IQ estimation; carrier frequency offset; digital OFDM receiver; direct down conversion; zero IF receivers; Baseband; Circuits; Degradation; Error correction; Fading; Frequency estimation; OFDM; Phase estimation; Power system modeling; System performance; CFO; Direct Down Conversion; IQ Imbalance; OFDM; Zero IF;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1466014

Filename

1466014